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Sponge Filters
PPI Comparison
4.25" Replacement for Hydro (sponge only)
6" Replacement for Hydro (sponge only)
Hydro Foam Replacement
Hydro Sponge Filter
Old-time Sponge Filter Style
Replacement Sponge for old-time filters
Old-time Sponge Filter Style
Old-time Spong Filter Lift Tube

Filter - Replacement Foam

$2.50
Shipping calculated at checkout.

Made from our Pro-Level Reticulated Foam, specifically suited for colonizing nitrifying bacteria at the highest levels in your aquarium.

As you can see from the list below, a 4.25" cube contains a lot more foam than a 4" one - over 20% more!

  • 3" cube filter has a volume of 27 cubic inches
  • 3.25" cube filter has a volume of 34 cubic inches
  • 4" cube filter has a volume of 64 cubic inches
  • 4.25" cube filter has a volume of 77 cubic inches
  • 5" cube filter has a volume of 125 cubic inches

The Filter - Replacement Foam destined to impress, and priced at only $2.50.

Inventory Last Updated: Sep 29, 2023

Customer Reviews

Based on 5 reviews
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J
Jim Randall
Filter repair

Restored my filters perfectly

C
Carolyn Butler
Foam Filters!

These r a great product! We use these in all our 25 tanks and nothing else!
Maintenance is so simple, a few squeezes in some changed out tank water and ur good to go! Recommend them to anybody!

J
Jason Reiss
Great buy

Excellent product

L
Leslie Hall
Great replacement foam

I use these in my 200 gallon outdoor goldfish pond as a prefilter on my waterfall pump. They go much longer than the original hydro sponges before they need cleaning. Highly recommend.

R
Rich German
Replacement sponges

I’ve used these sponges for about 20 years and they are the best you can buy.They last at least that long because I’m still using a couple of them yet. I’m so glad they’re made to fit the API filters so I don’t have to buy a whole new replacement

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